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18. It was ______ back home after the experiment.

A. not until midnight did he go　　 B. until midnight that he didn’t go

C. not until midnight that he went D. until midnight when he didn’t go

17. They don’t think she knew anything about it, ______?

A. did she　　　 B. do they　　　 C. didn’t she　 D. don’t they

16. Remember _________ off the light when _________ to bed.

A. turning, going　 B. to turn, to go　　 C. turning, to go　　 D. to turn, going

15. She wrote a famous book, and so _________ a place in history.

A. winning　　 B. to win C. to have won　　　 D. won

14. I came home very late last night. ______, early this morning.

A. at the latest B. or rather　　 C. in a word　 D. on the whole

13. All substances, _____ solids, liquids, or gases, are made up of entirely atoms.

　 A. whether they　　　　　　　 B. whether　　　

　 C. whether are they　　　　 D. whether are

12. 　It is the protection for the trees ______ really matters, rather than how many trees are planted.

A. what B. that 　 C. 不填 　　　 D. which

11. I’m sure you’d rather he stayed in Shanghai, _____?

　 A. aren’t I　　　　　 B. didn’t he

　 C. hadn’t you　　　　 D. wouldn’t you

10. So absorbed _____ in her work that she didn’t realize I was behind her.

　 A. did she　　　　　 B. was she　

　 C. she did　　　　　 D. she was

9. You must have been told about it that day, _____?

　 A. haven’t you　　　　 B. didn’t you

　 C. weren’t you　　　　 D. mustn’t you